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SUMMARY: Claviceps fusiformis usually produces a stable viscous glucan during submerged culture fermentations. A new strain 139/2/1 G of the fungus, which subsequently autolysed this glucan to glucose, was studied and the autolysis ascribed to a constitutive β1 3 glucanase and a β-glucosidase which were detected as soon as the fungal hyphae differentiated to a sclerotial form. The glucanase production followed a sigmoid pattern, reaching a maximum within 12 days, and the liberated glucose contributed to renewed growth towards the end of the fermentation. A sucrase and a maltase were also detected. Maximum glucan autolysis was achieved by using a large spore inoculum. This maintained minimal viscocity throughout the fermentation and, by maintaining adequate aeration, has since facilitated ergot alkaloid production by the organism.

Autolysis of Extracellular Glucans Produced in vitro by a Strain of Claviceps fusiformis